/sys$common/syshlp/helplib.hlb FORTRAN, Logical Names, FOR$PROCESSES  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  If defined during execution of a parallel processing application,
  this logical name controls the number of processes used.  The
  default is the number of processors available on the executing
  system.  The minimum is 1, the maximum is 32.  For more
  information, see the Compaq Fortran Performance Guide.